10 December 2010

That s quite impressive.

Battery and power4

  • Built-in 25-watt-hour rechargeable lithium-polymer battery
  • Up to 10 hours of surfing the web on Wi-Fi, watching video, or listening to music
  • Up to 9 hours of surfing the web using 3G data network
  • Charging via power adapter or USB to computer system
4.Testing conducted by Apple in March 2010 using preproduction iPad units and software. Testing consisted of full battery discharge while performing each of the following tasks: video playback, audio playback, and Internet browsing using Wi-Fi or 3G. Video content was a repeated 2-hour 23-minute movie purchased from the iTunes Store. Audio content was a playlist of 358 unique songs, consisting of a combination of songs imported from CDs using iTunes (128-Kbps AAC encoding) and songs purchased from the iTunes Store (256-Kbps AAC encoding). Internet over Wi-Fi and 3G tests were conducted using a closed network (for Wi-Fi only) and dedicated web and mail servers, browsing snapshot versions of 20 popular web pages, and receiving mail once an hour. All settings were default except: Wi-Fi was associated with a network (except for Internet browsing over 3G); the Wi-Fi feature Ask to Join Networks and Auto-Brightness were turned off. Battery life depends on device settings, usage, and many other factors. Battery tests are conducted using specific iPad units; actual results may vary.

Xiaoyu Guan (Sam)

most of geo-apps are instantly require gps signals, then the smartphone can stand for few hours, I think most of phone less than 5 hours. 
If you do a lot of web page viewing, photo taken, display always on. the smartphone will be useless.
Or for professional user, they need extra battery for smartphone phone.

Here is nice article

Smartphone Battery Life

Have a backup handy--either a spare battery for a case with a built-in battery.
Most phones pack in Lithium-ion battery, or Li-ion, ranging between 780mAh and 1200mAh. Phone batteries have a limited number of charge and discharge cycles, usually falling between 300 and 500. Beyond this lifespan, batteries gradually diminish below 50 percent of its original capacity. Whichever way you look at it, you'll probably need a new phone battery each year. Vendors shipped phones with proprietary chargers in the past that only worked with a specific phone. However, most newer phones ship with a USB charger for AC power that can be used with any phone, provided you have a cable with the standard USB connector on one side and a connector for your phone model on the other. Some phones ship with an extra battery and others, like the iPhone, sport a sealed-in battery that Apple replaces for a $79 fee. Battery life and charge cycles vary by the operating system, phone settings, network type (WiFi, CDMA/GSM, 2G/3G), and programs used.
Smartphones require lots of juice
Dumb phones (low to mid-end) provide around 400 hours of standby time and more than ten hours of talk time. Smartphones, however, are essentially tiny laptops that have lots more going on inside them than ordinary phones. Hence, they draw more juice. High-end smartphones provide up to ten hours talk time and up to 300 hours standby time. A typical smartphone features around five hours talk time on 3G (2-3 times more on 2G) and 150 hours standby time. However, these figures drop sharply when you play media and games or surf the web. Whichever way you look at it, you should buy a reserve battery because a typical smartphone won't carry you through the work day on a single charge. Business users who travel a lot should buy extras like car adapters and traveler kits. When evaluating a new phone, check its rated battery life and pay attention to testing conditions. For example, vendors usually conduct battery tests with 50 percent brightness, WiFi turned off, and no media playback. These settings skew the battery life unrealistically and rarely reflect real-life usage scenarios.
Buyers should note that some phones have removable batteries and some don't. While this isn't a major feature for most people, and lots of buyers will value the slim designs allowed by non-removable batteries, it is something to keep in mind. If you are a heavy phone user who makes a lot of calls and sends emailsconstantly, then you might want to keep a spare battery on hand. Many phones, like the iPhone, have cases available with built in batteries, but they add a bit of size and weight to the device. They are a good work-around, but they might not be exactly what demanding users are looking for.

Xiaoyu Guan (Sam)

OpenWater Symposium

Dear MapWindow Announcements List,

Because we have a large water modeling user group within the MapWindow community, I'm forwarding you this announcement about a workshop in Delft, Netherlands, April 18-19, 2011.

I will be presenting a workshops on MapWindow, DotSpatial, and HydroDesktop at this meeting. Please come join us!

Also remember that we are having the 2nd International MapWindow Users and Developers Conference in San Diego, California, June 13-15, 2011.

- Dan


Dear colleagues,

kindly be invited to the OpenWater symposium and workshops that takes place during the days April 18-19, 2011 and is hosted by the UNESCO-IHE Institute for Water Eduction, Delft, Netherlands.

The OpenWater symposium and workshops aim at sharing experiences for increasing the interoperability of new emerging ITC based systems, systems of systems and standards in the water domain. Several initiatives are currently taken to initiate open standards and interfaces under GEO, OGC, OpenMI association  and several research projects. OpenWater will be organised as series of invited presentations, dedicated workshops (MapWindow, SWAT-CUP, SDI, bringing GEOSS into practice...), and oral / poster presentations. Abstract are welcomed till January 15 2011 in the following areas:

Web services & OGC standards
Integrated modeling systems
Data transfer standards and  systems
Remote sensing and sensor observations
Mobile devices and information systems
Open source developments
Interoperability experiments
Interoperability in European  research and developments

More information can be obtained at: http://hikm.ihe.nl/openwater_eg/

Please forward this information to colleagues that might be interested to attend.

Kind regards,

Ann van Griensven

Dr. ir. Ann van Griensven
Associate Professor in Environmental Hydroinformatics
Department Hydroinformatics and Knowledge Management
UNESCO-IHE Institute for Water Education
P.O. Box 3015, 2601 DA DELFT, The Netherlands
Visiting address: Office W.321, UNESCO-IHE, Westvest 7, 2611 AX Delft, NL
tel +31 15 215 18 12
e-mail a.vangriensven@unesco-ihe.org

Daniel P. Ames, Ph.D. PE
Associate Professor, Geosciences
Idaho State University - Idaho Falls

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Xiaoyu Guan (Sam)